<?php

/**
 * 取得COOKIE的值
 *
 * @param string $name
 * @return unknown
 */
if ( ! function_exists('cookie')) {
	function cookie($name= ''){
		$name = defined('COOKIE_PRE') ? COOKIE_PRE.$name : strtoupper(substr(md5(MD5_KEY),0,4)).'_'.$name;
		return $_COOKIE[$name];
	}
}


/**
 * 加密函数
 *
 * @param string $txt 需要加密的字符串
 * @param string $key 密钥
 * @return string 返回加密结果
 */
if ( ! function_exists('encrypt')) {
	function encrypt($txt, $key = ''){
		if (empty($txt)) return $txt;
		if (empty($key)) $key = md5(MD5_KEY);
		$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
		$ikey = "-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";
		$nh1 = rand(0, 64);
		$nh2 = rand(0, 64);
		$nh3 = rand(0, 64);
		$ch1 = $chars{$nh1};
		$ch2 = $chars{$nh2};
		$ch3 = $chars{$nh3};
		$nhnum = $nh1 + $nh2 + $nh3;
		$knum = 0;
		$i = 0;
		while (isset($key{$i})) $knum += ord($key{$i++});
		$mdKey = substr(md5(md5(md5($key . $ch1) . $ch2 . $ikey) . $ch3), $nhnum % 8, $knum % 8 + 16);
		$txt = base64_encode(time() . '_' . $txt);
		$txt = str_replace(array('+', '/', '='), array('-', '_', '.'), $txt);
		$tmp = '';
		$j = 0;
		$k = 0;
		$tlen = strlen($txt);
		$klen = strlen($mdKey);
		for ($i = 0; $i < $tlen; $i++) {
			$k = $k == $klen ? 0 : $k;
			$j = ($nhnum + strpos($chars, $txt{$i}) + ord($mdKey{$k++})) % 64;
			$tmp .= $chars{$j};
		}
		$tmplen = strlen($tmp);
		$tmp = substr_replace($tmp, $ch3, $nh2 % ++$tmplen, 0);
		$tmp = substr_replace($tmp, $ch2, $nh1 % ++$tmplen, 0);
		$tmp = substr_replace($tmp, $ch1, $knum % ++$tmplen, 0);
		return $tmp;
	}
}
/**
 * 解密函数
 *
 * @param string $txt 需要解密的字符串
 * @param string $key 密匙
 * @return string 字符串类型的返回结果
 */
if ( ! function_exists('decrypt')) {
	function decrypt($txt, $key = '', $ttl = 0){
		if (empty($txt)) return $txt;
		if (empty($key)) $key = md5(MD5_KEY);

		$chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
		$ikey = "-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";
		$knum = 0;
		$i = 0;
		$tlen = @strlen($txt);
		while (isset($key{$i})) $knum += ord($key{$i++});
		$ch1 = @$txt{$knum % $tlen};
		$nh1 = strpos($chars, $ch1);
		$txt = @substr_replace($txt, '', $knum % $tlen--, 1);
		$ch2 = @$txt{$nh1 % $tlen};
		$nh2 = @strpos($chars, $ch2);
		$txt = @substr_replace($txt, '', $nh1 % $tlen--, 1);
		$ch3 = @$txt{$nh2 % $tlen};
		$nh3 = @strpos($chars, $ch3);
		$txt = @substr_replace($txt, '', $nh2 % $tlen--, 1);
		$nhnum = $nh1 + $nh2 + $nh3;
		$mdKey = substr(md5(md5(md5($key . $ch1) . $ch2 . $ikey) . $ch3), $nhnum % 8, $knum % 8 + 16);
		$tmp = '';
		$j = 0;
		$k = 0;
		$tlen = @strlen($txt);
		$klen = @strlen($mdKey);
		for ($i = 0; $i < $tlen; $i++) {
			$k = $k == $klen ? 0 : $k;
			$j = strpos($chars, $txt{$i}) - $nhnum - ord($mdKey{$k++});
			while ($j < 0) $j += 64;
			$tmp .= $chars{$j};
		}
		$tmp = str_replace(array('-', '_', '.'), array('+', '/', '='), $tmp);
		$tmp = trim(base64_decode($tmp));

		if (preg_match("/\d{10}_/s", substr($tmp, 0, 11))) {
			if ($ttl > 0 && (time() - substr($tmp, 0, 11) > $ttl)) {
				$tmp = null;
			} else {
				$tmp = substr($tmp, 11);
			}
		}
		return $tmp;
	}
}
/**
 * 检测FORM是否提交
 * @param  $check_token 是否验证token
 * @param  $check_captcha 是否验证验证码
 * @param  $return_type 'alert','num'
 * @return boolean
 */
if ( ! function_exists('checkSubmit')) {
	function checkSubmit($check_token = false, $check_captcha = false, $return_type = 'alert'){
		/*
		$submit = isset($_POST['form_submit']) ? $_POST['form_submit'] : $_GET['form_submit'];
		if ($submit != 'ok') return false;
		if ($check_token && !Security::checkToken()) {
			if ($return_type == 'alert') {
				showDialog('Token error!');
			} else {
				return -11;
			}
		}
		if ($check_captcha) {
			if (!checkSeccode($_POST['nchash'], $_POST['captcha'])) {
				setNcCookie('seccode' . $_POST['nchash'], '', -3600);
				if ($return_type == 'alert') {
					showDialog('验证码错误!');
				} else {
					return -12;
				}
			}
			setNcCookie('seccode' . $_POST['nchash'], '', -3600);
		}
		*/
		return true;
	}
}